I had done root canal in my tooth 5 years back. There no pain at all but from a few days there is a burning sensation on left side of my mouth including throat & a lot of irritated pimple sort of things on tongue. What could be the cause? is there anything serious.

It simply ulcer
2- you must do betadien gargle 4timrs aday
3- for tongue ulcer apply dologel ct on affected area befor meal.

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